[android-developers] Why two fragments instead of one?

In most Fragment exemples there are two fragments, for instance a list
to the left and a content area to the right where you see things you
have selected in the list. Do you really need two fragments for this
or could the left part be a simple ListView instead?

I'm also confused about the example at
http://android-developers.blogspot.com/2011/02/android-30-fragments-api.html
where there seems to be two fragments, but the second one (called
details) is declared as a FrameLayout in the xml.

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